Difference between revisions of "Rust-Programming-Language/C2/Enums/English"

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'''Title Slide'''
 
'''Title Slide'''
−
|| Welcome to the Spoken Tutorial on '''Enums in Rust.'''
+
|| Welcome to the Spoken Tutorial on '''Enums in Rust '''.
 
|-  
 
|-  
 
|| '''Slide 2'''
 
|| '''Slide 2'''
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||
 
||
 
* The following code file is required to practise this tutorial.
 
* The following code file is required to practise this tutorial.
−
* This file is provided in the Code Files link of this tutorial page.
+
* This file is provided in the '''Code Files''' link of this tutorial page.
  
 
|-  
 
|-  
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'''Enums'''
 
'''Enums'''
 
||
 
||
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* Enums (or enumerations) is a user-defined data type.
+
* '''Enums''' (or enumerations) is a user-defined data type.
 
* It allows us to select a value from a list of related values.
 
* It allows us to select a value from a list of related values.
 
* An enumerated type is declared using the '''enum''' keyword.
 
* An enumerated type is declared using the '''enum''' keyword.
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|-  
 
|-  
 
|| Open '''Visual''' '''code editor'''
 
|| Open '''Visual''' '''code editor'''
−
|| Open the '''Visual studio code editor.'''
+
|| Open the '''Visual Studio code editor.'''
 
|-  
 
|-  
 
|| In the menu bar, click on '''Terminal''' and select''' New Terminal'''.
 
|| In the menu bar, click on '''Terminal''' and select''' New Terminal'''.
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Type the command '''cargo new enumdemo '''and press '''Enter.'''
 
Type the command '''cargo new enumdemo '''and press '''Enter.'''
 +
 
Open the created project as shown.
 
Open the created project as shown.
 
|-  
 
|-  
 
|| Point to the '''main.rs''' file.
 
|| Point to the '''main.rs''' file.
  
−
|| In the '''main.rs '''file, copy and paste the code from the Code file.
+
|| In the '''main.rs ''' file, copy and paste the code from the Code file.
 
|-  
 
|-  
 
|| Pub enum Direction {
 
|| Pub enum Direction {
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Press Ctrl + S
 
Press Ctrl + S
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|| Here''' Direction '''is an '''enum''' with four possible values.  
+
|| Here''' Direction ''' is an '''enum''' with four possible values.  
  
 
They are: up, down, left, and right.
 
They are: up, down, left, and right.
  
−
These enum values are known as '''variants'''.
+
These '''enum''' values are known as '''variants'''.
  
−
'''Direction'''::'''Up''' represents '''enum variant''' '''Up''' of the '''Direction''' enum
+
'''Direction'''::'''Up''' represents '''enum variant Up''' of the '''Direction''' enum
  
 
We can access the '''enum''' variants whenever we have to use a '''direction''' in our program.
 
We can access the '''enum''' variants whenever we have to use a '''direction''' in our program.
  
−
In the''' main '''function, we are accessing the “'''Left'''” variant.
+
In the ''' main '''function, we are accessing the “'''Left'''” variant.
  
 
Save the program. Let us execute the code and see the output.
 
Save the program. Let us execute the code and see the output.
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}Ctrl + S
 
}Ctrl + S
−
||  
+
|| This code simulates a traffic light system which changes colors at specified intervals.
−
 
+
−
This code simulates a traffic light system which changes colors at specified intervals.
+
  
 
'''TrafficLight enum''' has 3 variants as Red, Yellow and Green.
 
'''TrafficLight enum''' has 3 variants as Red, Yellow and Green.
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The '''main''' function begins with an infinite loop.
 
The '''main''' function begins with an infinite loop.
  
−
The '''for''' loop iterates over the range from''' '''1 to 28, in the reverse order.
+
The '''for''' loop iterates over the range from 1 to 28, in the reverse order.
  
 
Note that''' .rev() '''means reverse order.
 
Note that''' .rev() '''means reverse order.
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'''match''' statement is used to print the current color of the traffic light along with the duration.
 
'''match''' statement is used to print the current color of the traffic light along with the duration.
  
−
After printing the traffic light status, the program pauses for 1 second i.e (1000 milliseconds) .
+
After printing the traffic light status, the program pauses for 1 second that is (1000 milliseconds) .
  
 
Then the loop continues.
 
Then the loop continues.
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We can see that traffic light color and its duration running continuously.
 
We can see that traffic light color and its duration running continuously.
  
−
To terminate the program, press '''Ctrl''' and''' C''' keys together.
+
To terminate the program, press '''Ctrl''' and ''' C''' keys together.
 
|-  
 
|-  
 
|| '''Slide 7'''
 
|| '''Slide 7'''

Revision as of 17:57, 25 August 2025

Visual Cue Narration
Slide 1

Title Slide

Welcome to the Spoken Tutorial on Enums in Rust .
Slide 2

Learning Objectives

In this tutorial, we will learn about:
  • Enums
Slide 3

System Requirements

This tutorial is recorded using,
  • Ubuntu Linux OS version 22.04
  • Rust 1.80.0
  • Visual Studio Code 1.19.0
Slide 4

Prerequisites

To follow this tutorial, you should be familiar with compiling and running a Rust program.
Slide 5

Code Files

  • The following code file is required to practise this tutorial.
  • This file is provided in the Code Files link of this tutorial page.
Slide 6

Enums

  • Enums (or enumerations) is a user-defined data type.
  • It allows us to select a value from a list of related values.
  • An enumerated type is declared using the enum keyword.
Let us understand about enums using a rust program.
Open Visual code editor Open the Visual Studio code editor.
In the menu bar, click on Terminal and select New Terminal. In the menu bar, click on Terminal and select New Terminal.
> cd Desktop/MyRustProject

> cargo new enumdemo

In the menu bar, File >> Open folder

>> Desktop >> MyRustProject >> enumdemo

Let us go to our working directory MyRustProject as explained earlier.

Type the command cargo new enumdemo and press Enter.

Open the created project as shown.

Point to the main.rs file. In the main.rs file, copy and paste the code from the Code file.
Pub enum Direction {

Up,

Down,

Left,

Right,

}

fn move_direction(dir: Direction) {

match dir {

Direction::Up => println!("Move Up"),

Direction::Down => println!("Move Down"),

Direction::Left => println!("Move Left"),

Direction::Right => println!("Move Right"),

}

}

fn main() {

let dir = Direction::Left;

move_direction(dir);

}

Press Ctrl + S

Here Direction is an enum with four possible values.

They are: up, down, left, and right.

These enum values are known as variants.

Direction::Up represents enum variant Up of the Direction enum

We can access the enum variants whenever we have to use a direction in our program.

In the main function, we are accessing the “Left” variant.

Save the program. Let us execute the code and see the output.

Click on terminal and select New Terminal.

In the terminal, type cargo run.

Point to the output.

In the menu bar, click on Terminal and select New Terminal.

In the terminal, type cargo run.

It prints “Move Left” as the output.

Delete the existing code. Next we will see another example for enum.

Clear the window and copy and paste the code from the Code file.

use std::thread::sleep;

use std::time::Duration;

enum TrafficLight {

Red,

Yellow,

Green,

}

fn main() {

loop {

for item in (1..=28).rev() {

let now = match item {

1..=15 => TrafficLight::Red,

16..=18 => TrafficLight::Yellow,

19..=28 => TrafficLight::Green,

_ => TrafficLight::Red,

};

match now {

TrafficLight::Red => println!("🔴 Duration: {}", item),

TrafficLight::Yellow => println!("🟡 Duration: {}", item - 15),

TrafficLight::Green => println!("🟢 Duration: {}", item – 18),

} sleep(Duration::from_millis(1000));

}

}

}Ctrl + S

This code simulates a traffic light system which changes colors at specified intervals.

TrafficLight enum has 3 variants as Red, Yellow and Green.

The code imports the sleep function from the std:: thread module.

Duration struct from the std::time module is used to create pauses in the loop.

The main function begins with an infinite loop.

The for loop iterates over the range from 1 to 28, in the reverse order.

Note that .rev() means reverse order.

The match statement assigns a value to the variable now based on the current item value.

The range values are assigned to red, yellow and green.

match statement is used to print the current color of the traffic light along with the duration.

After printing the traffic light status, the program pauses for 1 second that is (1000 milliseconds) .

Then the loop continues.

Save the program.

In the terminal, type cargo run

press Ctrl and C keys

In the terminal, type cargo run

We can see that traffic light color and its duration running continuously.

To terminate the program, press Ctrl and C keys together.

Slide 7

Summary

In this tutorial, we learn about

Enums

This brings us to the end of this tutorial.

Let us summarize.

Slide 8

Assignment

As an Assignment, do the following:
  • Define an enum Operation with variants: Add, Subtract, Multiply, and Divide.
  • Write a function calculate with two f64 numbers and one Operation
  • Function returns the f64 result.
  • In the main function, call calculate with different operations and print the results.
Slide 9

Thank You

Thank you for joining.

Contributors and Content Editors

Madhurig, Nirmala Venkat

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